[
    {
        "num_letters": 5,
        "num_add": 4
    },
    {
        "num_letters": 4,
        "num_add": 2
    },
    {
        "num_letters": 4,
        "num_add": 3
    },
    {
        "num_letters": 3,
        "num_add": 2
    }
]